4-Player PVE Mission, complete objectives and successfuly escape! Infiltrate sneaking in or go guns blazing in a strange secret military facility in the middle of nowhere, to find a special material in the underground facility laying under the surface. [The difficulty update!] -The difficulty of the upper part is now lowered and the difficulty of the lower part is now increased to be more concise. -Changed the shotgun of the sniper build to a rare ranged pistol.